Furnace for heating ingots or billets.



No. 694,569. Patented Mar. 4,1902.

- J. B. NAU.

FURNACE FOR HEATING INGUTS 0B BILLETS.

(Application filed Sept. 28, 1901.)

(No Model.)

y vfwza 2o 9% avwemfoz I 1H5 W UNITED ST TES PATENT OFFICE.

JOHN B. NAU, OF NEW YORK, N. Y. v

FURNACE FOR HEATING INGOTS OR BULLETS,

SPECIFICATIbN forming part of Letters Patent No. 694,569,dated March 4, 1902.

Application filed $eptember 28, 1901. Serial No. 76,954. (No model.)

To all whom it mayconcern:

Be it known that 1, JOHN B. NAU, a citizen of the United States, residingin the borough of Queens, city of New York,'State'o't' New York, have invented certai'n new and useful Improvements. in Furnaces for Heating Ingots or Billets of Iron and Steel, of which the following is a specification.

This invention relates to the class of f urnaces in which ingots of metal are fed at one end of the furnace and discharged at the other and in which the series of ingots occupying the furnace is pushed forward by the next ingot introduced, the ingot at the delivery end being thus brought to the top of an inclined track, down which and out of the furnace it slides.

The invention comprises certain novel features of construction hereinafter set out in detail.

In the accompanyingdrawings, Figure l is a longitudinal vertical section; 'Fig. 2, a horizontalsection of the delivery end of the fur-- nace on the line A B CD'of Fig. 3, and Fig. 3 a vertical section on the line E F'G H I J of Fig. 2.

The heating-chamber 1, inclosed between roof 2, floor 3, and side walls 4, isprovided at one end with a charging-opening closed by a door 10, preferably slidable vertically-gas shown, and at the other end with a dischargeopening, to which is applied a swinging door 5, hinged at its upper edge. The floor 3 is provided with two or more parallel series of posts or piers 6, on which are mounted waterpipes 7, constituting an ingot-track and extending from the charging to the delivery opening of the furnace. At a point marked 8 a convenient distance in front ofthe rear wall 9 the waterpipes incline downward,

forming an angle with the horizontal or nearly horizontal portions of the pipes in front of said point, andextend through the dischargeopening of the furnace.

The oblong ingots or billets w are deposited in front of the charging-door 10 and on the pipe-track 7 7, and the door being opened are pushed one at a time into the furnace by any suitable means, a hydraulic ram 11 being shown. For each ingot or billet so pushed into the furnace the one atthe delivery end of the series will be pushed beyond the point pieces 13.

8, when it will slide down the track or incline, forcing the door open and coming upon an incline table or support outside the f urn ace. This table may be slightly inclined, as shown, and may be formed of two or more heavy pieces of steel or iron 13, running in the same direction as the pipes 7. The discontinuity between the inclined level of the pipes 7 and the level of the raised pieces 13 is filled out by cast-iron or any other pieces 32, clamped to pieces 13, so that the top of these pieces 13 have the same inclination as pipes 7, and the ingots after leaving the pipes slide easily over pieces 32 to land on raised However the table may be constructed, it should have parts l3 raised sufficiently far above the floor or face 14 to allow a pair of heavy books 15, suspended from a crane, to be lowered between the parts 13 in such manner that the arms a of the hooks are lower than the top faces 1) of the parts 13. To prevent a discharged ingot traveling too far, a stop 16 is applied to each part 13 to arrest the ingot in proper position above the lower arms of the hooks 15, so thatit can be lifted without handling and be transferred to the bloomingmill table or the rolling-mill conveyer. While the ingots or billets are thus caused to travel from the charging-door to and out of the door 5, the furnace is heated in such a way that the greatest temperature will be at or near the point 8, extend over the space occupied by a few ingots, and then gradually decrease in the direction of the charging-door 10. To attain this,I build in front and above the discharging-door 5a platform 17,-supported on I-beams 18, which rest at their ends on piers 19. On thisplatform is built a gasfiue 20, with gas-ports 21, and on top of the gas-flue is built the air-flue 22, with air-ports 23, respectively in line above the gas-ports 21. Both flues 20 and 22 extend the whole width of the furnace. Each gas-port 21 and its corresponding air-port 23 above it open into a flame-port 24, where the air and gas thoroughly mix and being ignited enter the furnace as a bright flame. Instead of having one flame-port for each set of air and gas ports partitions between the flame-ports may be removed, forming one or'more combustion chambers above and behind the bridge-wall 9. Instead of having gas-flue 20 below air- ICO fine 22 the reverse may be done and air-fine 22 may be laid below gas-flue 20. The direction of the flame entering the furnace can be regulated by the inclination of the flameports. The wall 9 is supported by an air or water cooled lintel 26. The fiame sweeps through the furnace and the products of combustion enter the'smoke-flne 28 through one or more passages 27, located between piers 6.

The furnace is provided in its side walls 4 with a number of openings 29, that are to be closed by suitable doors. To facilitate removal of slag or scale, which is more apt to be deposited upon the bottom of the hottest part of the furnace, the floor of the furnace isinclined somewhat sharply from a point in the neighborhood of the point 8 toward the charging end and also from a point 30 toward the delivery end, openings 31 being formed in the side walls at the point of juncture of the two inclines for removal of scale or slag. Suit-able doors will be applied to the openings 31.

The billets or ingots 03 are spaced or separated by angle-pieces so that all their faces are freely exposed to heat.

33 and 34, Fig. 3, respectively indicate cleaning holes normally closed by brickwork, but which may be opened for access to the air and gas fines 22 and 20.

I claim as my invention- 1. A furnace for heating ingots or billets, comprising a heating chamber having an opening at one end for the introduction of ingots or billets and an opening at the opposite end for their discharge, a bridge or flameport wall above the discharge-opening, a platform above and outside the discharge-opening, a gas-flue and an air-flue carried by the platform, gas-ports and air-ports leading respectively from such gas and air fines and uniting in pairs in a flame port through which the fiaine passes into the furnace, a track extending from the charging-opening through the heating-chamber in a substantially horizontal plane to within a suitable distance of the flame-port wall and from there in a sharply-inclined plane under the flame-port wall and through the dischargeopening, a floor with reverse converging inclined parts, a slag-opening located at the bottom of the converging parts, and a pusher standing in front of the charging-door, substantially as described.

2. A furnace for heating billets or ingots, comprising a heatingchamber having an opening at one end for the introduction of ingots or billets and an opening at the opposite end for their discharge, a bridge or flameport wall above the discharge-openin g, a platform above and outside of the dischargeopening, a gas-flue and an air-fine carried by the platform, gas-ports and air-ports leading respectively from said gas and air fines and uniting in pairs in a flame-port through which the flame passes into the furnace, a

track extending from the charging-opening through the heating-chamber in a substantially horizontal plane to within a suitable distance from the flame-port wall and from therein a sharply-inclined plane under the flame-port wall and through the dischargeopening,an inclined table forming a continua tion of the track but with less incline, and having raised parts to receive the billets and a stop to arrest them, a floor with reverse, converging, inclined parts, a slag-opening located at the bottom of the inclined parts, and a pusher standing in front of the chargingdoor, substantially as described.

3. A heating-furnace for heating billets or ingots, comprising a heating-chamber having an opening at one end for the introduction of ingots or billets and an opening at the opposite end for their discharge, a bridge or flameport wall above the discharge-opening, a platform above and outside of the discharge-opening, a gas-fine and an air-flue carried by the platform, gas-ports and air-ports leading respectively from said gas and air fines and uniting in pairs in a flame-port through which the flame passes into the furnace, a track extending from the charging-opening through the heating-chamber in a substantially horizontal plane to Within a suitable distance from the flame-port wall, and from there ina sharply-inclined plane under the flame-port wall and through the discharge-opening, an inclined table forming a continuation of the track, but withless incline, and having raised parts to receive the billets and a stop to arrest them, crane hooks or tongs set loosely between said raised parts in such a way that when the billets are stopped they will lie over the hooks, a floor with reverse converging inclined parts, slag-openings located at the bottom of the inclined parts, and a pusher standing in front of the charging-doors, substantially as described.

4. A furnace for heating ingots or billets, comprising a heatingchamber having an opening at one end for the introduction of ingots or billets and an opening at the opposite end for their discharge, a bridge or flame-port wall above the discharge-opening, a platform above and outside the discharge-opening, a gas-flue and air-fine carried by the platform, gas-ports and air-ports leading respectively from such gas and air fines and unitingin pairs in a flame-port through which the flame passes into the furnace, a track extending from the charging-opening through the heating-chamber in a substantially horizontal plane to within asnitable distance of thdfiame-portwall and from there in a sharply-inclined plane under the flame-port wall and through the dischargeopening, and a pusher,standing in front of the charging-door, substantially as described.

5. A billet or ingot heating furnace comprising a heating-chamber having charging and delivery openings, means for pushing the billets or ingots into the charging-opening, a

track upon which the billets slide inclined 'at I In testimony whereof I have hereunto subthe delivery end and extending through the I scribed my name. delivery-opening, stops for arresting the discharged billets or ingots, and hoisting devices so arranged and located that they engage automatically the discharged billets or ingots when they are arrested by the stops.

JOHN B. NAU.

Witnesses:

J R. THOMPSON, ROSE L. BENNETT. 

